From The Journal of the Royal Microscopical Society, 1902, page 353
Pillischer's
"Lenticular Microscope"
Mr. J. Pillischer,
of Bona Street, has most kindly presented this very
interesting portable, really pocket, Microscope to
the Society's Cabinet. It was designed by the late
Mr. M. Pillischer, the donor's uncle.
The instrument is
figured and described in Urinary Deposits by
Golding Bird (p. 29, fig. 13, 1857, 5th ed.), but
it will be noticed that the figure differs slightly
from the original, inasmuch as a second spring to
hold the slide has been added, and a semicircular
segment cut out at both ends instead of at one end
of the base-plate as there shown.
The design of this
instrument (fig. 67) is most ingenious: there is
neither stand nor limb, the main basis of the
instrument being the slide- holder, at one angle of
which is a short pillar containing a direct-acting
screw fine adjustment, which acts upon a swinging
arm carrying the lens. Below the stage is a mirror
attached to a jointed arm, and a wheel of
diaphragms. The lenses, three in number, are
Coddingtons of 1/4, 1/10 and 1/25 -in. foci.
It may be pointed
out, says E. M. Nelson, that an instrument of this
kind, fitted with achromatic loups, would be very
serviceable to a microscopist for field
work.
It will be remembered
that three of Dr. Gairdner's Microscopes, made by
Bryson of Edinburgh, were exhibited, figured, and
described in the journal for 1899, p. 643, fig.
149.
These had Coddington
lenses, each power having a separate Microscope to
itself. Gairdner's Microscope was described in the
first edition of Carpenter on the Microscope, 1866,
p. 74, fig. 15, and there it is said to be of use
in bed-side investigations of urinary
deposits.
In design, Gairdner's
Microscope is far inferior to that of Pillischer's,
inasmuch as there is no possibility of either
moving the slide under the lens, or the lens over
the slide, so nothing can be seen except the single
point iu the axis of the lens.